# An echo returned in 3 s. What is the distance of the reflecting surface from the source, given that the speed of sound is 342 m s^−1? - Science

An echo returned in 3 s. What is the distance of the reflecting surface from the source, given that the speed of sound is 342 m s−1?

#### Solution

Speed of sound, v = 342 m s−1

Echo returns in time, t = 3 s

Distance travelled by sound = v × = 342 × 3 = 1026 m

In the given time interval, sound has to travel a distance that is twice the distance of the reflecting surface and the source.

Hence, the distance of the reflecting surface from the source =1026/2m=513m

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#### APPEARS IN

NCERT Class 9 Science Textbook
Chapter 12 Sound
Q 1 | Page 168